Merge branch 'fix-note-update' into 'master'

Fix note update In some strange cases Ruby thinks `system` is not AR field but Kernel.system call and raises exception during save. It should prevent this random wierd behaviour. Exception log: ``` ArgumentError (wrong number of arguments (0 for 1+)): app/models/note.rb:505:in `system' app/models/note.rb:505:in `editable?' app/controllers/projects/notes_controller.rb:33:in `update' ``` See merge request !1326

Merge branch 'fix-note-update' into 'master'
14ab0228 · Dmitriy Zaporozhets · 19865b7c · 4ab728bf · 14ab0228
Commit 14ab0228 authored Dec 15, 2014 by Dmitriy Zaporozhets
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note.rb app/models/note.rb +1 -1

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--- a/app/models/note.rb
+++ b/app/models/note.rb
@@ -502,6 +502,6 @@ class Note < ActiveRecord::Base
  end

  def editable?
-    !system
+    !read_attribute(:system)
  end
 end